The new twenty dollar bills are on the way, with new fifty and  one hundred dollar bills in the next 12-18 months.  Since this is a mainly a cash based area, here is a link to learn about the new currency.  Hope it helps.
PS  If you are ever in DC the tour of the  Bureau of Printing and Engraving is cool.

Thanks for that Modprod, lots of good info there! I took the tour a long time ago and even bought one of those ink pens stuffed with shredded money lol, that was bizare to me, that they shred all that cash!!!

I don't want to be a bummer, But; I can't help thinking that the development of these "new" bills must have cost a lot of them( I'll have to find a report on that for details) and it wasn't that long ago that the Fed  spent a load of cash developing the last "new" bills that were supposed to solve all of the counterfieting problems and obviously didn't. Or we wouldn't need more new bills already!